How to add books to your Kindle

Quick answer

Books you buy from Amazon show up on their own. Everything else, like an EPUB from a publisher or a PDF someone sent you, needs a push. According to Amazon's Send to Kindle help page, Send to Kindle supports EPUB, PDF, TXT, RTF, HTML and common image files, and you can send through the web, email, the Kindle phone apps or the desktop apps.

What 125x is: 125x is a web app at 125x.app. You connect your YouTube subscriptions, and it gives you a feed of the latest videos from the channels you follow, each with a summary: a verdict, the 5 key takeaways, and the spoiler, plus Actionable and Lessons tabs with more tips. You read that and decide what's actually worth opening.

Open 125x

The quick picker

One file from a computer: Send to Kindle on the web. Amazon lists a 200 MB limit there.
From your phone: share the file to the Kindle app.
From anywhere, often: email it to your device's Send to Kindle address.
No wifi, or lots of files: USB. See Kindle USB transfer.
Big library, wrong formats, metadata to fix: Calibre.

Things that trip people up

Using an email address that isn't on your approved list.
EPUBs that fail with an error. See our EPUB fixes.
Forgetting to turn on Add to your library on the web uploader, so the book doesn't follow you to other devices.

Where 125x fits

On 125x, every video in your subscriptions feed comes with a summary: a verdict, 5 takeaways and the spoiler, plus an Actionable tab with steps and a Lessons tab with the bigger ideas. Lots of readers decide which book to buy next from author talks and book reviews on YouTube. The verdict tells you which ones are worth the time.

FAQ: questions people ask

Can I put EPUB books on my Kindle?

Yes. Amazon's Send to Kindle supports EPUB.

What's the easiest way to add a book to Kindle?

Send to Kindle on the web for one file, or the phone app share sheet.

Can I add books to Kindle without wifi?

Yes, by USB. Newer models on a Mac need Amazon's Send to Kindle app for Mac.